blackberry takes long time to load after restart ?!!

Why the Blackberry devices takes so long to reboot?

Sometimes my BB Bold takes up to 10 minutes to reboot?? why ?

All blackberries seem to be that way. It's like a computer; it takes time to boot up, verify data, start up programs, etc. I don't know about it being 10 min, but my 8100 takes about 2 minutes to boot after I hard reset it.

When you "reboot", do you mean turning on and off the BB? If you did that, try a hard reset (remove the battery, wait about 30 sec, then reinsert it). Usually that solves software problems and loading times.